package com.foreveross.weixin.servlet;

import java.io.IOException;
import java.io.PrintWriter;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import com.foreveross.weixin.common.Constant;
import com.foreveross.weixin.service.CoreService;
import com.foreveross.weixin.util.SignUtil;



/**
 * 核心请求处理类
 * 
 * @author wangming
 * @date 2014-03-05
 */
public class CoreServlet extends HttpServlet {
	private static final long serialVersionUID = 4440739483644821986L;

	/**
	 * 确认请求来自微信服务器
	 */
	public void doGet(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		// 微信加密签名
		String signature = request.getParameter(Constant.SIGNATURE);
		// 时间戳
		String timestamp = request.getParameter(Constant.TIMESTAMP);
		// 随机数
		String nonce = request.getParameter(Constant.NONCE);
		// 随机字符串
		String echostr = request.getParameter(Constant.ECHOSTR);

		PrintWriter out = response.getWriter();
		// 通过检验signature对请求进行校验，若校验成功则原样返回echostr，表示接入成功，否则接入失败
		if (SignUtil.checkSignature(signature, timestamp, nonce)) {
			out.print(echostr);
			
			System.out.println("signature:"+signature);
			System.out.println("timestamp:"+timestamp);
			System.out.println("nonce:"+nonce);
			System.out.println("echostr:"+echostr);
		}
		out.close();
		out = null;
	}
	
	/**
	 * 处理微信服务器发来的消息
	 */
	public void doPost(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		// 将请求、响应的编码均设置为UTF-8（防止中文乱码）  
        request.setCharacterEncoding("UTF-8");  
        response.setCharacterEncoding("UTF-8");  
  
        // 调用核心业务类接收消息、处理消息  
        String respMessage = CoreService.processRequest(request);  
        System.out.println(respMessage);
        // 响应消息  
        PrintWriter out = response.getWriter();  
        out.print(respMessage);  
        out.close();  
	}
	

}
